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To measure the temperature coefficient o...

To measure the temperature coefficient of resistivity `alpha` of a semiconductor,an electrical arrangement shown in the figure is prepared.The arm "BC" is made up of the semiconductor.The experiment is being conducted at `25^(@)C` and resistance of the semiconductor arm is `3m Omega` .Arm "BC" is cooled at a constant rate of `2^(@)C"/"s` .If the galvanometer "G" shows no deflection after "10s" ,then `alpha` is :

A

`-1.5times10^(-2).^(@)C-1`

B

`-2times10^(-2).^(@)C^(-1)`

C

`-2.5times10^(-2).^(@)C-1`

D

`-1times10^(-2).^(@)C-1`

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